Timequest - max skew

Hello,

Can anyone suggest the best way to minimize skew between signals of a data bus that is output to a peripheral? I noticed the manual for TimeQuest lists the max_skew command, but when I use it in the SDC file, it isn't recognized.

In other words, how does one get Quartus to place signals of the same group (e.g. Data[7..0]) such that each data bit is no more than Xns from any other bit?

Thanks.